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The patent EP3809009 was granted to Hitachi Astemo on Oct 30, 2024. The application was filed on Jun 11, 2019 under application number EP19819182A. The patent is currently recorded with a legal status of "Granted And Under Opposition".
A vehicular disc brake that suppresses uneven wear of friction pads, comprising a caliper bracket, a caliper body, and friction pads disposed on both sides of a disc rotor. The caliper body has an action part with cylinder holes for pistons and a bridge part extending across the disc rotor's outer periphery. Thinned parts are formed in the bridge part's disc-radially inner wall, with one part on the disc turn-in side having a smaller volume than the other part on the disc turn-out side.

Patent oppositions filed by competitors challenge the validity of a granted patent. These oppositions are typically based on claims of prior art, lack of novelty, or non-obviousness. They are a key part of the process for determining a patent's strength and enforceability.
Patent citations refer to prior patents cited during different phases such as opposition or international search.
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